下列属于网络应用的有（）。
A.网上邮件
B.电子商务
C.电子政务
D.远程教育
参考答案：A, B, C, D
When I went to Liu Feng's home yesterday evening,he ____dinner. [ ]
A. was having
B. had
C.will have
D. has had
Whipple三联症指
A．癫痫样发作，空腹血糖＜50mg/dl，用葡萄糖后症状缓解
B．腹痛，血清胰岛素值高于正常，用葡萄糖后症状缓解
C．癫痫样发作，空腹血糖＜50mg/dl，静注胰高血糖素后症状缓解
D．腹痛，空腹血糖＜50mg/dl，用葡萄糖后症状缓解
E．空腹恶心呕吐，甲苯磺丁脲激发试验阳性，静注胰高血糖素后症状缓解
